纯电动车机械式自动变速器换挡非线性建模及控制

Firstly, linear and nonlinear multi-freedom torsional vibration models of the electrified powertrain are established respectively which contains a clutchless two-speed Automated Mechanical Transmission (AMT). The sliding sleeve's speed fluctuation and dynamic behaviors of the two models at different phases of shift process are analyzed. The differences of shift quality between the two models are compared. Secondly, a time delay Proportional-Integral-Derivative (PID) control method of speed difference at the motor speed phase is proposed to improve shift quality. The results show that the nonlinear torsional vibration of gears extends shift time, increases shift impact and friction work of synchronizer. Appropriate time delay can decrease shift time and minish impact peak and friction work.